On 10/4/2015 10:05 AM, John S wrote:
How less efficient is a short vertical than a 1/4 vertical?

You are starting to sound like someone else.


I would like to see some numbers. It is a ground plane with 4 radials
(typical). Free space.

Assume a source at the base. The type of source is your choice. EZNEC
defaults to one amp, but can be changed to a constant power of your choice.

I'm sure I've left out additional requirements, but maybe this will be a
healthy discussion even so. Suggestions are welcome.

Don't you need to define all the characteristics of the antenna? I
guess an impedance specification will suffice.

I don't know what electrical model EZNEC uses for the transmitter, but
won't you need to deal with impedance mismatch at that point? Or does
the model use a current drive with infinite impedance (or conversely a
voltage drive with zero impedance)?

--

Rick